Sleep Deprivation, Sick, and Feeling Like a Zombie Again!

I have a horrible headache, and I felt sick and weak earlier today.  I even missed church again. 
I know part of that is from sinus allergies, but I think some of it is from sleep deprivation. I was up way too late last night, but I should have been okay, because the schedule changed, and I didn't have to be at church until 1:00 p..m.  I guess it didn't help much that two nights in a row last week I stayed up all night on Facebook, and then went to bed.  I guess I haven't caught up on sleep since then.  Why do I do this to myself?